I've been reading and enjoying the site immensely.
What is the "Endgame Tablebase"? I see it referenced frequently.
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Endgame tablebases are essentially databases containing known endgame positions that have been “solved”, so to speak. That is, every position in an endgame tablebase will have a corresponding result which will either be a win for white, a win for black, or a draw (assuming perfect play). They are used by chess engines because it is much more efficient for the computer to look up an endgame position in a database to get the result of the endgame rather than exhausting all the possible variations to determine the result.
Endgame table base is a huge tree of information, which solves the game of chess, with minimum number of pieces. We have reached up to 7 pieces up till now and the best quality tablebase is maintained by Ronald de Man at syzygy endgame tables